. ♪ we're the kids in america ♪ oh, oh, oh i think it can. one of the challenges for kayla being gluten-free is actually finding choices the whole family will love. five flavors of chex are gluten-free, including the honey nut flavor, and that's amazing to a mom like me. as a parent you dot want to have to tell your kids "no" all the time. it's nice for me to be able to say "yes" to something th they want to eat. [ male announcer ] chex cereal. five flavors. gluten free. >>> welcome back. a research team at stanford is working technology that mimics the human nose. carolyn johnson has more. >> the average pneumonia nose can distinguish among 200 scents and they are attempting to duplicate it in a machine. >> for example, when we smell things, it's multiple, molecules will interact with multiple receptors. >> reporter: in his lab at stanford, the professor and his team are manufacturing synthetic dna but instead of controlling functions in the body, their dna reacts with compounds in the environment. >> we want to be able to smell contaminants